/Engine/Plugins/Runtime/nDisplay/Source/DisplayCluster/Public/Render/Viewport/IDisplayClusterViewportProxy.h
Returns ptr to ViewportManagerProxy (the owner of this viewport proxy) if it still exists.
const [IDisplayClusterViewportManagerProxy](API\Plugins\DisplayCluster\Render\Viewport\IDisplayClusterViewportManagerPr-) * GetViewportManagerProxy_RenderThread() const